Method and apparatus for use in communication node for wireless communication

Abstract

The present application discloses a method and an apparatus for use in a communication node for wireless communication. The method comprises: a communication node receiving a first RRC message, the first RRC message comprising configuration information for early uplink synchronization for a first candidate cell and configuration information for UE-based TA measurement for the first candidate cell; receiving first signaling, the first signaling indicating a first TA of the first candidate cell; and in response to reception of the first signaling, applying the first TA of the first candidate cell, wherein the UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell. The solution proposed in the present application facilitates enhancement of an early TA acquisition procedure in existing conditional LTM, thereby enabling a flexible TA acquisition mechanism.

Description

A method and apparatus for use in a communication node for wireless communication

[0001] This application claims priority to Chinese Patent Application No. 2024117994319, filed on December 9, 2024, entitled "A Method and Apparatus for Use in a Communication Node for Wireless Communication", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to transmission methods and apparatus in wireless communication systems, and more particularly to methods and apparatus for early timing acquisition of conditional LTM. Background Technology

[0003] With the continuous development of wireless communication, the requirements for mobility, transmission latency, and system capacity are becoming increasingly stringent. 3GPP, through the "Further NR mobility enhancements" work item (WI), completed the standardization of L1 / L2 Triggered Mobility (LTM). To further enhance mobility, conditional LTM or inter-CU LTM became an important research topic in 3GPP Release 19.

[0004] To enhance the LTM process, LTM supports early uplink synchronization and UE-based advance timing measurement. In early uplink synchronization, the serving cell triggers random access on LTM candidate cells via PDCCH order. After the UE sends a preamble on the LTM candidate cell, it does not receive a RAR. The serving cell then sends the candidate cell's TA to the UE via the LTM Cell Switch Command MAC CE. Given that early uplink synchronization and UE-based advance timing measurement can significantly reduce handover latency, applying early uplink synchronization to conditional LTM, inter-CU LTM, CHO, or CPC has good standardization prospects. Summary of the Invention

[0005] The inventors discovered that in the early uplink synchronization process based on PDCCH order in Conditional LTM, the TA of the candidate cell is sent to the terminal before C-LTM is executed, and its validity is maintained by the terminal. When the terminal is configured with both early uplink synchronization based on PDCCH order and TA measurement based on UE, it may maintain two TA acquisition processes at the same time, resulting in unnecessary resource consumption. Therefore, it is necessary to reasonably design the priority of these two TA acquisition methods. UEs that have already obtained TA through early uplink synchronization based on PDCCH order should release the resources for TA measurement based on UE, so that the protocol can obtain early TA of Conditional LTM more efficiently and flexibly.

[0006] To address the aforementioned issues, this application provides a solution. While C-LTM is used as an example in the problem description, this application is also applicable to other handover scenarios based on execution conditions, such as CHO or CPC, achieving similar technical effects to C-LTM. Furthermore, although this application provides a specific implementation method for early uplink synchronization based on PDCCH order, it can also be used in other early uplink synchronization scenarios to achieve similar technical effects. In addition, using a unified solution for different scenarios helps reduce hardware complexity and cost.

[0007] As an example, the interpretation of the terminology in this application is based on the definitions in the 3GPP specification protocol TS36 series.

[0008] As an example, the interpretation of terms in this application is based on the definitions in the 3GPP specification protocol TS38 series.

[0009] As an example, the interpretation of terms in this application is based on the definitions in the 3GPP specification protocol TS37 series.

[0010] It should be noted that, unless otherwise specified, the embodiments and features in any node of this application can be applied to any other node. Furthermore, unless otherwise specified, the embodiments and features in any embodiment of this application can be arbitrarily combined with each other.

[0011] This application discloses a method for use in a terminal, including:

[0012] Receive a first RRC message, the first RRC message including configuration information for early uplink synchronization for the first candidate cell and configuration information for UE-based TA measurement for the first candidate cell;

[0013] Receive first signaling; wherein, the first signaling indicates the first TA of the first candidate cell;

[0014] In response to the receipt of the first signaling, the first TA of the first candidate cell is applied;

[0015] The UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell.

[0016] As an example, the problem this application aims to solve includes: how to enhance the priority mechanism for early TA acquisition in existing LTM.

[0017] As an example, the problem this application aims to solve includes: how to enhance the existing LTM early TA acquisition mechanism to make it applicable to conditional LTM.

[0018] As an example, the problem this application aims to solve includes: how to handle situations where conditional LTM is configured with both early uplink synchronization based on PDCCH order and TA measurement based on UE.

[0019] As an example, the problem this application aims to solve includes: how to handle situations where early uplink synchronization based on PDCCH order and TA measurement based on UE simultaneously obtain valid TA.

[0020] As an example, the problem this application aims to solve includes: how to handle situations where only one of early uplink synchronization based on PDCCH order and TA measurement based on UE is valid TA.

[0021] As an example, the problem this application aims to solve includes: how to handle situations where neither early uplink synchronization based on PDCCH order nor TA measurement based on UE obtains a valid TA.

[0022] As an example, the features of the above method include: the UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell.

[0023] As an example, the advantages of the above method include: it facilitates the enhancement of the early TA acquisition process of existing conditional LTMs and enables a flexible TA acquisition mechanism.

[0024] As an example, the advantages of the above method include: it facilitates the flexible adaptation of the protocol to different TA acquisition methods.

[0025] As an example, the advantages of the above method include: the above method helps to simplify the early TA acquisition process.

[0026] As an example, the advantages of the above method include: it helps to reduce signaling interactions.

[0027] According to one aspect of this application, in response to the first TA of the first candidate cell, a first timeAlignmentTimer is started; the UE-based TA measurement for the first candidate cell depends on the operating state of the first timeAlignmentTimer.

[0028] As an example, the advantages of the above method include: it helps the terminal maintain the effectiveness of TA.

[0029] As an example, the advantages of the above method include: it helps to reduce signaling interaction overhead.

[0030] According to one aspect of this application, in response to the first TA of the first candidate cell, the UE-based TA measurement for the first candidate cell is stopped.

[0031] As an example, the advantages of the above method include: it helps to reduce the resource consumption of early TA when a valid TA has already been obtained.

[0032] As an example, the advantages of the above method include: facilitating the coordination of various early TA acquisition methods and reducing the overhead of the UE in the RACH-less phase.

[0033] According to one aspect of this application, the UE-based TA measurement for the first candidate cell is started when the running time of the first timeAlignmentTimer is not less than a first threshold; the first threshold is not greater than the value of the first timeAlignmentTimer.

[0034] As an example, the advantages of the above method include: facilitating collaboration among different early TA acquisition methods.

[0035] According to one aspect of this application, the difference between the first TA and the second TA is greater than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0036] As an example, the advantages of the above method include: improving the robustness of the early TA acquisition process.

[0037] According to one aspect of this application, the difference between the first TA and the second TA is less than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0038] As an example, the advantages of the above method include: improving the robustness of the early TA acquisition process.

[0039] According to one aspect of this application, in response to the first condition being met, the configuration of the first candidate cell is applied;

[0040] The configuration information of the first candidate cell includes the first condition; the first condition depends on at least the L1 measurement for the first serving cell and the L1 measurement for the first candidate cell.

[0041] As an example, the advantages of the above method include: it facilitates the triggering of conditional LTM switching.

[0042] As an example, the advantages of the above method include: it facilitates the terminal to quickly switch to the first candidate cell.

[0043] As an example, the advantages of the above method include: it helps to reduce modifications to existing protocols.

[0044] According to one aspect of this application, before the first signaling is received, a first preamble is sent in the first candidate cell as a response to the receipt of the first PDCCH order;

[0045] Wherein, the first PDCCH order indicates the first Preamble; the configuration information for early uplink synchronization of the first candidate cell includes the first Preamble.

[0046] As an example, the advantages of the above method include: it facilitates the early uplink synchronization process of the first candidate cell.

[0047] As an example, the advantages of the above method include: it helps to reduce modifications to existing protocols.

[0048] This application discloses a terminal, including:

[0049] The terminal includes: one or more processors and memory;

[0050] The memory is coupled to the one or more processors, and the memory is used to store computer program code, the computer program code including computer instructions, which the one or more processors invoke to cause the terminal to perform the method described in any of the foregoing aspects.

[0051] This application discloses a method used in a base station, comprising:

[0052] Send a first RRC message, the first RRC message including configuration information for early uplink synchronization for the first candidate cell and configuration information for UE-based TA measurement for the first candidate cell;

[0053] Send a first signaling instruction; wherein the first signaling instruction indicates the first TA of the first candidate cell;

[0054] In this context, the recipient of the first RRC message, in response to receiving the first signaling, applies the first TA of the first candidate cell; the UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell.

[0055] According to one aspect of this application, the recipient of the first RRC message, in response to the first TA of the first candidate cell, starts a first timeAlignmentTimer; the UE-based TA measurement for the first candidate cell depends on the operating state of the first timeAlignmentTimer.

[0056] According to one aspect of this application, the recipient of the first RRC message, in response to the first TA applied to the first candidate cell, stops the UE-based TA measurement for the first candidate cell.

[0057] According to one aspect of this application, the UE-based TA measurement for the first candidate cell is started when the running time of the first timeAlignmentTimer is not less than a first threshold.

[0058] Wherein, the first threshold is not greater than the value of the first timeAlignmentTimer.

[0059] According to one aspect of this application, the difference between the first TA and the second TA is greater than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0060] According to one aspect of this application, the difference between the first TA and the second TA is less than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0061] According to one aspect of this application, in response to the first condition being met, the configuration of the first candidate cell is applied;

[0062] The configuration information of the first candidate cell includes the first condition; the first condition depends on at least the L1 measurement for the first serving cell and the L1 measurement for the first candidate cell.

[0063] According to one aspect of this application, before sending the first signaling, a first preamble is received in the first candidate cell as a response to sending the first PDCCH order;

[0064] Wherein, the first PDCCH order indicates the first Preamble; the configuration information for early uplink synchronization of the first candidate cell includes the first Preamble.

[0065] This application discloses a base station, including:

[0066] The base station includes: one or more processors and a memory;

[0067] The memory is coupled to the one or more processors and is used to store computer program code, the computer program code including computer instructions, which the one or more processors invoke to cause the base station to perform the method in the communication node used for wireless communication.

[0068] As an example, compared with conventional solutions, this application has the following advantages:

[0069] - It facilitates the enhancement of the early TA acquisition process for existing conditional LTMs, enabling a flexible TA acquisition mechanism.

[0070] - It facilitates the protocol's flexibility in adapting to different TA acquisition methods.

[0071] - The above method helps to simplify the early TA acquisition process.

[0072] - It helps reduce signaling interactions.

[0073] - It helps reduce the resource consumption of early TAs when effective TAs have already been obtained.

[0074] - It facilitates the priority selection of different early TA acquisitions in the protocol.

[0075] - It facilitates the coordination of various early TA acquisition methods and reduces the overhead of the UE in the RACH-less phase.

[0076] - It helps improve the robustness of the early TA acquisition process.

[0077] - It helps to verify the effectiveness of early TA.

[0078] - This facilitates the terminal's rapid switching to the first candidate cell.

[0079] - It helps reduce changes to existing agreements. Attached Figure Description

[0080] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0081] Figure 1 shows a flowchart according to an embodiment of this application;

[0082] Figure 2 shows a schematic diagram of a network architecture according to an embodiment of this application;

[0083] Figure 3 illustrates a schematic diagram of an embodiment of a wireless protocol architecture for the user plane and control plane according to an embodiment of this application;

[0084] Figure 4 shows a schematic diagram of a first communication device and a second communication device according to an embodiment of this application;

[0085] Figure 5 shows a flowchart of wireless signal transmission according to an embodiment of this application;

[0086] Figure 6 shows a schematic diagram illustrating the relationship between the first TA and the second TA and the second threshold according to an embodiment of this application;

[0087] Figure 7 shows a schematic diagram illustrating the relationship between the first TA and the second TA and the second threshold according to another embodiment of this application;

[0088] Figure 8 shows a structural block diagram of a processing device for a terminal according to an embodiment of the present application;

[0089] Figure 9 shows a structural block diagram of a processing apparatus for a base station according to an embodiment of the present application. Detailed Implementation

[0090] The technical solution of this application will be further described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0091] Example 1

[0092] Example 1 illustrates a flowchart of an embodiment according to this application, as shown in Figure 1. In Figure 1, each box represents a step. It is particularly important to emphasize that the order of the boxes in the figure does not represent the temporal sequence of the steps represented.

[0093] In Embodiment 1, the terminal in this application receives a first RRC message in step 101, the first RRC message including configuration information for early uplink synchronization of the first candidate cell and configuration information for UE-based TA measurement of the first candidate cell; in step 102, it receives a first signaling, wherein the first signaling indicates the first TA of the first candidate cell; in step 103, in response to the receipt of the first signaling, the first TA of the first candidate cell is applied.

[0094] The UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell.

[0095] As an example, the first RRC message is an RRC reconfiguration message.

[0096] As an example, the first RRC message is an RRCReconfiguration message.

[0097] As an example, the first RRC message is used to configure at least the first candidate cell.

[0098] As an example, the first RRC message contains a ConditionalReconfiguration IE.

[0099] As an example, the first RRC message contains a CondReconfigToAddModList IE.

[0100] As an example, the CondReconfigToAddModList IE in the first RRC message contains one or more CondReconfigToAddMod fields.

[0101] As an example, the first RRC message is an LTM-Config IE.

[0102] As an example, the first RRC message includes an LTM-Config IE.

[0103] As an example, the first RRC message configures the first candidate cell.

[0104] As an example, the configuration conditions of the first RRC message are reconfigured.

[0105] As an example, the first RRC message configures continuous conditional reconfiguration.

[0106] As an example, the first RRC message includes an LTM-Config field.

[0107] As an example, the first RRC message includes an LTM-Candidate field.

[0108] As an example, the LTM-Candidate field includes an ltm-CandidateId field; the ltm-CandidateId field indicates the first candidate cell.

[0109] As an example, the LTM-Candidate field includes an ltm-CandidatePCI field; the ltm-CandidatePCI field indicates the physical cell ID of the candidate cell.

[0110] As an example, the first RRC message configures the configuration information of the first candidate cell.

[0111] As an example, the configuration information of the first candidate cell is an LTM-Candidate field.

[0112] As an example, the configuration information of the first candidate cell includes an LTM-CandidateId field.

[0113] As an example, the LTM-CandidateId field indicates the configuration information of the first candidate cell.

[0114] As an example, the LTM-CandidateId field indicates the candidate cell configuration ID of the first candidate cell.

[0115] As an example, the first candidate cell is an LTM candidate cell.

[0116] As an example, the first candidate cell is a Conditional LTM candidate cell.

[0117] As an example, the first candidate cell is a CHO candidate cell.

[0118] As an example, the first candidate cell is a CPC candidate cell.

[0119] As an example, the first candidate cell is a CPA candidate cell.

[0120] As an example, the first candidate cell is a CPAC candidate cell.

[0121] As an example, the first candidate cell is an SCPAC candidate cell.

[0122] As an example, the first serving cell is the PCell of the terminal.

[0123] As an example, the first serving cell is the SPCell of the terminal.

[0124] As an example, the first serving cell is the PSCell of the terminal.

[0125] As an example, the first signaling is a DCI.

[0126] As an example, the first signaling is a MAC CE.

[0127] As an example, the first signaling is Early Sync Timing Advance Command MAC CE.

[0128] As an example, the first signaling is Candidate Cell Timing Advance Command MAC CE.

[0129] As an example, the first signaling is Candidate Cell Early Sync Timing Advance Command MAC CE.

[0130] As an example, the name of the first signaling includes at least Candidate Cell.

[0131] As an example, the name of the first signaling includes at least Early Sync.

[0132] As an example, the first signaling is not LTM Cell Switch Command MAC CE.

[0133] As one embodiment, applying the first TA includes: storing the first TA.

[0134] As an example, storing the first TA means storing the first TA in the first UE variable.

[0135] As an example, the first UE variable is in the RRC sublayer.

[0136] As an example, the first UE variable is in the MAC sublayer.

[0137] As an example, the first UE variable is a single variable.

[0138] As an example, the first UE variable is a buffer.

[0139] As an example, the first UE variable is a memory.

[0140] As an example, the first UE variable includes the first condition for the first candidate cell.

[0141] As an example, the first UE variable is VarLTM-Config.

[0142] As an example, the first UE variable is ltm-ReferenceConfiguration.

[0143] As an example, the first UE variable is ltm-CandidateList.

[0144] As an example, the first UE variable is VarCLTM-Config.

[0145] As an example, the first UE variable is VarCondLTM-Config.

[0146] As an example, the first UE variable is VarCondLTM-candidateTA.

[0147] As an example, the first TA is stored in a subfield of the first UE variable.

[0148] As an example, the first TA is stored in the LTM-Candidate-r18 subfield of the first UE variable.

[0149] As an example, the early uplink synchronization includes early RACH.

[0150] As an example, the first signaling is a RAR.

[0151] As an example, receiving the first signaling means receiving the first signaling on the first serving cell.

[0152] As an example, the first signaling indicates the first candidate cell.

[0153] As an example, the first signaling includes a first field, in which the candidate cell identifier of the first candidate cell is indicated.

[0154] As an example, the first signaling indicates the first TA.

[0155] As one embodiment, the first signaling includes a second field, which indicates the first TA.

[0156] As an example, the second field is a Timing Advance Command field.

[0157] As an example, the size of the second field is 6 bits.

[0158] As an example, the size of the second field is 12 bits.

[0159] As an example, the second field is a Timing Advance Command MAC CE.

[0160] As an example, the size of the second field is 8 bits.

[0161] As an example, the second field is an Absolute Timing Advance Command MAC CE.

[0162] As an example, the size of the second field is 16 bits.

[0163] As one example, the first signaling indicates one or more TAs.

[0164] As an example, the first candidate cell is one of the one or more candidate cells.

[0165] As an example, the first TA is one of the one or more TAs.

[0166] As one example, the first signaling indicates one or more timing advances.

[0167] As a sub-example of the above embodiments, the timing advance refers to TA.

[0168] As a sub-example of the above embodiments, each of the one or more timing advances corresponds to one or more cells.

[0169] As a sub-implementation of the above embodiments, each of the one or more timing advances corresponds to a TAG, and the TAG contains one or more cells.

[0170] As a sub-implementation of the above embodiments, the first signaling indicates the first TA, and the first TA corresponds to the first candidate cell.

[0171] As one example, the first signaling indicates one or more candidate cells.

[0172] As a sub-example of the above embodiments, each of the one or more candidate cells corresponds to a timing advance.

[0173] As a sub-example of the above embodiments, each of the one or more candidate cells corresponds to two timing advances.

[0174] As a sub-example of the above embodiments, each of the one or more candidate cells corresponds to multiple timing advances.

[0175] As a sub-implementation of the above embodiments, the first candidate cell is one of the one or more candidate cells.

[0176] As a sub-implementation of the above embodiments, the first TA is the timing advance corresponding to the first candidate cell.

[0177] As an example, the first TA is for the first candidate cell.

[0178] As an example, the number of bits used by the domain indicating the first candidate cell in the first signaling is fixed.

[0179] As an example, the number of bits in the first signaling indicating the domain occupied by the first candidate cell is variable.

[0180] As one embodiment, the number of bits occupied by the field indicating the first candidate cell in the first signaling depends on the number of candidate cells indicated by the first signaling.

[0181] As one embodiment, the number of bits in the first signaling indicating the domain occupancy of the first candidate cell depends on the number of candidate cells configured for the first serving cell.

[0182] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is equal to floor(log2(number of candidate cells indicated by the first signaling)).

[0183] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is equal to floor(log2(number of candidate cells configured for the first serving cell)).

[0184] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is equal to floor(log2(number of candidate cells indicated by the first signaling + 1)).

[0185] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is equal to floor(log2(number of candidate cells configured for the first serving cell + 1)).

[0186] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is 3 bits.

[0187] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is 4 bits.

[0188] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is 5 bits.

[0189] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is 6 bits.

[0190] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is 7 bits.

[0191] As an example, the number of bits occupied by the field indicating the first candidate cell in the first signaling is 8 bits.

[0192] As an example, the number of bits occupied by the field used to indicate the first TA in the first signaling is 6 bits.

[0193] As an example, the number of bits occupied by the field used to indicate the first TA in the first signaling is 8 bits.

[0194] As an example, the number of bits occupied by the field used to indicate the first TA in the first signaling is 12 bits.

[0195] As an example, the first TA is used to indicate the TA of the first candidate cell.

[0196] As an example, the first TA is used to indicate the relative value of the TA of the first candidate cell.

[0197] As a sub-implementation of the above embodiments, the first signaling indicates the first TAG ID, and the first TA indicates the difference between the TA of the first candidate cell and the current TA value of the first TAG.

[0198] As a sub-implementation of the above embodiments, the first signaling indicates the first TAG ID, and the first TA indicates the difference between the current TA value of the first TAG and the TA of the first candidate cell.

[0199] As a sub-implementation of the above embodiments, when the first signaling is received, if the TAG corresponding to the first TAG ID does not have a valid TA, then the TA of the first candidate cell indicated by the first TA is invalid.

[0200] As a sub-implementation of the above embodiments, when the first signaling is received, if the timeAlignmentTimer of the TAG corresponding to the first TAG ID has expired, then the TA of the first candidate cell indicated by the first TA is invalid.

[0201] As a sub-example of the above embodiment, the first TA indicates the difference between the current TA value of the first candidate cell and the PTAG of the terminal.

[0202] As a sub-example of the above embodiment, the first TA indicates the difference between the terminal's PTAG and the current TA value of the first candidate cell.

[0203] As a sub-implementation of the above embodiments, when the first signaling is received, if the terminal's PTAG does not have a valid TA, then the TA of the first candidate cell indicated by the first TA is invalid.

[0204] As a sub-implementation of the above embodiment, when the first signaling is received, if the timeAlignmentTimer of the terminal's PTAG has expired, then the TA of the first candidate cell indicated by the first TA is invalid.

[0205] As an example, the first TA is used to indicate the absolute value of the TA of the first candidate cell.

[0206] As an example, the first TA indicates the TA of the serving cell PTAG of the terminal.

[0207] As an example, the first TA indicates the adjustment value of the TA of the serving cell PTAG of the terminal.

[0208] As an example, the first TA indicates the absolute value of the TA of the serving cell PTAG of the terminal.

[0209] As an example, when the value of the field used to indicate the first TA in the first signaling is FFF, it indicates that there is no valid TA on the first candidate cell.

[0210] As an example, when all bits in the field used to indicate the first TA in the first signaling are 1, it indicates that there is no valid TA in the first candidate cell.

[0211] As an example, if there is no TA for the first candidate cell in the first signaling, it means that there is no valid TA on the first candidate cell.

[0212] As an example, the number of bits occupied by the first signaling is fixed.

[0213] As one example, the number of bits occupied by the first signaling is variable.

[0214] As one example, the number of bits occupied by the first signaling depends on the number of candidate cells indicated by the first signaling.

[0215] As one example, the number of bits occupied by the first signaling depends on the number of candidate cells configured for the first serving cell.

[0216] As one embodiment, the first signaling includes at least two octets.

[0217] As one embodiment, the first signaling consists of two octets.

[0218] As one embodiment, the first signaling consists of multiple octets.

[0219] As an example, the field indicating the first candidate cell and the field indicating the first TA in the first signaling occupy two consecutive octets.

[0220] As an example, the field indicating the first candidate cell and the field indicating the first TA in the first signaling belong to different octets.

[0221] As one embodiment, the first signaling includes multiple TAs.

[0222] As one example, the number of TAs included in the first signaling depends on the number of candidate cells configured for the first serving cell.

[0223] As one embodiment, the number of TAs included in the first signaling depends on the number of candidate cells configured for the first serving cell that support uplink synchronization.

[0224] As one embodiment, the number of TAs in the first signaling depends on the number of candidate cells configured for the first serving cell that support early uplink synchronization and have configured execution conditions.

[0225] As an example, the order of the multiple TAs in the first signaling depends on the order of the candidate cells in the first RRC message configuration.

[0226] As an example, the order of the multiple TAs in the first signaling depends on the order of the candidate cells in the first UE variables.

[0227] As an example, the order of the multiple TAs in the first signaling depends on the order of the candidate cells that support early uplink synchronization in the configuration of the first RRC message.

[0228] As an example, the order of the multiple TAs in the first signaling depends on the order of the candidate cells supporting early uplink synchronization in the first UE variables.

[0229] As an example, the order of the multiple TAs in the first signaling depends on the order of the candidate cells that support early uplink synchronization and have configured execution conditions in the first RRC message.

[0230] As an example, the order of the multiple TAs in the first signaling depends on the order of the candidate cells in the first UE variables that support early uplink synchronization and have configured execution conditions.

[0231] As an example, in the multiple TAs of the first signaling, when all the bits corresponding to a certain TA are 1, it means that the candidate cell corresponding to the TA has no valid TA.

[0232] As an example, among the multiple TAs in the first signaling, when the value of a certain TA is FFF, it means that the candidate cell corresponding to the TA has no valid TA.

[0233] As an example, in the multiple TAs of the first signaling, when the bits corresponding to a certain TA are not all 1, the value of the TA represents the valid TA of the candidate cell corresponding to it.

[0234] As an example, among the multiple TAs in the first signaling, when the value of a certain TA is not FFF, the value of the TA represents the valid TA of the candidate cell corresponding to it.

[0235] As an example, in response to the receipt of the first signaling, the timeAlignmentTimer for uplink time alignment of the first candidate cell is either not started or restarted.

[0236] As an example, whether or not the UE-based TA measurement for the first candidate cell is performed depends on the first TA.

[0237] As an example, whether or not the UE-based TA measurement for the first candidate cell is performed depends on the value of the first TA.

[0238] As an example, whether or not the UE-based TA measurement for the first candidate cell is performed depends on the validity of the first TA.

[0239] As an example, the UE-based TA measurement for the first candidate cell depending on the first TA of the first candidate cell means that when the first TA of the first candidate cell is valid, the UE-based TA measurement is not performed.

[0240] As an example, the first TA being valid means that the TAT associated with the first TA is running.

[0241] As an example, "the first TA is valid" means that the value of the first TA is valid.

[0242] As an example, the first TA being valid means that the first TA can be used for uplink transmission in the first candidate cell.

[0243] As an example, not performing the UE-based TA measurement means stopping the ongoing UE-based TA measurement.

[0244] As an example, not performing the UE-based TA measurement means stopping the ongoing UE-based TA measurement of the first candidate cell.

[0245] As an example, not performing the UE-based TA measurement means: not starting the UE-based TA measurement.

[0246] As an example, not performing the UE-based TA measurement means deactivating the UE-based TA measurement.

[0247] As an example, not performing the UE-based TA measurement means that the UE-based TA measurement is not configured for the first candidate cell.

[0248] As an example, the UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell, which means that the UE-based TA measurement is performed when the first TA of the first candidate cell is invalid.

[0249] As an example, the invalidity of the first TA means that the TAT associated with the first TA has timed out or is not running.

[0250] As an example, "the first TA is invalid" means that the value of the first TA is invalid.

[0251] As an example, the first TA being invalid means that the first candidate cell has no available TA.

[0252] As an example, performing the UE-based TA measurement means: starting the UE-based TA measurement.

[0253] As an example, performing the UE-based TA measurement means: not stopping the UE-based TA measurement.

[0254] As an example, performing the UE-based TA measurement means activating the UE-based TA measurement.

[0255] As an example, performing the UE-based TA measurement means: assuming that the UE-based TA measurement has been configured for the first candidate cell.

[0256] Example 2

[0257] Example 2 illustrates a schematic diagram of a network architecture according to an embodiment of this application, as shown in Figure 2. Figure 2 illustrates a network architecture 200 for a 5G NR (New Radio) / LTE (Long-Term Evolution) / LTE-A (Long-Term Evolution Advanced) system. The 5G NR / LTE / LTE-A network architecture 200 may be referred to as 5GS (5G System) / EPS (Evolved Packet System) 200, or some other suitable term. 5GS / EPS 200 includes at least one of UE (User Equipment) 201, RAN (Radio Access Network) 202, 5GC (5G Core Network) / EPC (Evolved Packet Core) 210, HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and Internet service 230. 5GS / EPS can interconnect with other access networks, but these entities / interfaces are not shown for simplicity. As shown in the figure, 5GS / EPS provides packet-switched services; however, those skilled in the art will readily understand that the various concepts presented throughout this application can be extended to networks providing circuit-switched services or other cellular networks. The RAN includes node 203 and other nodes 204. Node 203 provides user and control plane protocol termination toward UE 201. Node 203 can be connected to other nodes 204 via an Xn interface (e.g., backhaul) / X2 interface. Node 203 may also be referred to as a base station, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), TRP (transmitter-receiver node), or some other suitable term. Node 203 provides UE 201 with an access point to the 5GC / EPC 210. Examples of UE201 include cellular phones, smartphones, Session Initiation Protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, non-terrestrial base station communications, satellite mobile communications, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, drones, aircraft, narrowband IoT devices, machine-type communication devices, land vehicles, automobiles, wearable devices, or any other similar functional devices.Those skilled in the art may also refer to UE201 as a mobile station, subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, radio terminal, remote terminal, handheld device, user agent, mobile client, client, or any other suitable term. Node 203 is connected to 5GC / EPC210 via the S1 / NG interface. 5GC / EPC210 includes MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF 214, S-GW (Service Gateway) / UPF (User Plane Function) 212, and P-GW (Packet Data Network Gateway) / UPF 213. MME / AMF / SMF 211 is the control node that handles signaling between UE201 and 5GC / EPC210. In general, the MME / AMF / SMF211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through the S-GW / UPF212, which is itself connected to the P-GW / UPF213. The P-GW provides UE IP address allocation and other functions. The P-GW / UPF213 connects to Internet service 230. Internet service 230 includes operator-compliant Internet Protocol services, specifically including the Internet, intranet, IMS (IP Multimedia Subsystem), and packet-switched streaming services.

[0258] As an example, the UE201 corresponds to the terminal described in this application.

[0259] As an example, the UE201 is a user equipment (UE).

[0260] As an example, the UE201 is a base station (BS).

[0261] As an example, the UE201 is a relay device.

[0262] As an example, the UE201 is a gateway device.

[0263] As an example, node 203 corresponds to the base station in this application.

[0264] As one example, node 203 is a base station device.

[0265] As an example, node 203 is a user equipment.

[0266] As one example, node 203 is a relay device.

[0267] As one example, node 203 is a gateway device.

[0268] Typically, UE201 is a user equipment and node203 is a base station device.

[0269] Typically, UE201 is a user equipment, and node203 is a user equipment.

[0270] Typically, UE201 is a base station device, and node203 is a base station device.

[0271] As one example, the user equipment supports transmission over a non-terrestrial network (NTN).

[0272] As an example, the user equipment supports terrestrial network transmission.

[0273] As an example, the user equipment supports dual connection (DC) transmission.

[0274] As one example, the user equipment includes an aircraft.

[0275] As one embodiment, the user equipment includes an in-vehicle terminal.

[0276] As one example, the user equipment includes a vessel.

[0277] As one example, the user equipment includes an Internet of Things (IoT) terminal.

[0278] As one example, the user equipment includes a terminal for the Industrial Internet of Things (IIoT).

[0279] As one embodiment, the user equipment includes devices that support low-latency, high-reliability transmission.

[0280] As one embodiment, the user equipment includes testing equipment.

[0281] As one embodiment, the user equipment includes a signaling tester.

[0282] As one embodiment, the user equipment includes IAB (Integrated Access and Backhaul)-MT (Mobile Termination).

[0283] As an example, the base station equipment supports transmission over non-terrestrial networks.

[0284] As one example, the base station equipment supports transmission over a terrestrial network.

[0285] As one embodiment, the base station equipment includes a Base Transceiver Station (BTS).

[0286] As one embodiment, the base station equipment includes a NodeB (NB).

[0287] As one embodiment, the base station equipment includes a gNB.

[0288] As one example, the base station equipment includes an eNB.

[0289] As one example, the base station equipment includes an ng-eNB.

[0290] As one embodiment, the base station equipment includes an en-gNB.

[0291] As one embodiment, the base station equipment includes a CU (Centralized Unit).

[0292] As one embodiment, the base station equipment includes a DU (Distributed Unit).

[0293] As one embodiment, the base station equipment includes a TRP (Transmitter Receiver Point).

[0294] As one example, the base station equipment includes a macrocell base station.

[0295] As one embodiment, the base station equipment includes a microcell base station.

[0296] As one example, the base station equipment includes a pico cell base station.

[0297] As one example, the base station equipment includes a femtocell.

[0298] As one embodiment, the base station equipment includes flight platform equipment.

[0299] As one example, the base station equipment includes satellite equipment.

[0300] As one embodiment, the base station equipment includes testing equipment.

[0301] As one embodiment, the base station equipment includes a signaling tester.

[0302] As one embodiment, the base station equipment includes a gateway device.

[0303] As one embodiment, the base station equipment includes an IAB-node.

[0304] As one example, the base station equipment includes an IAB-donor.

[0305] As one embodiment, the base station equipment includes IAB-donor-CU.

[0306] As one embodiment, the base station equipment includes IAB-donor-DU.

[0307] As one embodiment, the base station equipment includes an IAB-DU.

[0308] As one example, the base station equipment includes IAB-MT.

[0309] As one embodiment, the relay device includes a relay.

[0310] As one embodiment, the relay device includes an L3 relay.

[0311] As one embodiment, the relay device includes an L2 relay.

[0312] As one example, the relay device includes a router.

[0313] As one example, the relay device includes a switch.

[0314] As one embodiment, the relay device includes a gateway device.

[0315] As one embodiment, the relay equipment includes user equipment.

[0316] As one embodiment, the relay device includes a base station device.

[0317] Example 3

[0318] Example 3 illustrates a schematic diagram of an embodiment of a wireless protocol architecture for a user plane and control plane according to this application, as shown in Figure 3. Figure 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300. Figure 3 shows the radio protocol architecture for the control plane 300 in three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (Physical Layer) signal processing functions. The L1 layer will be referred to herein as PHY 301. Layer 2 (L2 layer) 305 is above PHY 301 and includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security through encrypted data packets and provides cross-area mobility support. RLC sublayer 303 provides upper-layer packet segmentation and reassembly, retransmission of lost packets, and packet reordering to compensate for out-of-order reception caused by HARQ (Hybrid Automatic Repeat Request). MAC sublayer 302 provides multiplexing between the logical and transport channels. MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) within a cell. MAC sublayer 302 is also responsible for HARQ operations. RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3) of the control plane 300 is responsible for acquiring radio resources (i.e., radio bearers) and using RRC signaling to configure the lower layers. The radio protocol architecture of user plane 350 includes Layer 1 (L1 layer) and Layer 2 (L2 layer). In user plane 350, the radio protocol architecture for physical layer 351, PDCP sublayer 354 in L2 layer 355, RLC sublayer 353 in L2 layer 355, and MAC sublayer 352 in L2 layer 355 is largely the same as the corresponding layers and sublayers in control plane 300. However, PDCP sublayer 354 also provides header compression for upper layer packets to reduce radio transmission overhead. L2 layer 355 in user plane 350 also includes SDAP (Service Data Adaptation Protocol) sublayer 356. SDAP sublayer 356 is responsible for mapping between QoS streams and data radio bearers (DRBs) to support service diversity.

[0319] As an example, the wireless protocol architecture in Figure 3 is applicable to the terminal described in this application.

[0320] As an example, the wireless protocol architecture in Figure 3 is applicable to the base station described in this application.

[0321] As an example, the first RRC message in this application is generated in RRC306.

[0322] As an example, the first Preamble in this application is generated by MAC302 or MAC352.

[0323] As an example, the first Preamble in this application is generated in the PHY301 or PHY351.

[0324] As an example, the first PDCCH order in this application is generated by MAC302 or MAC352.

[0325] As an example, the first PDCCH order in this application is generated in the PHY301 or PHY351.

[0326] As an example, the first signaling in this application is generated in the RRC306.

[0327] As an example, the first signaling in this application is generated in MAC302 or MAC352.

[0328] As an example, the first signaling in this application is generated in the PHY301 or PHY351.

[0329] Example 4

[0330] Embodiment 4 illustrates a schematic diagram of a first communication device and a second communication device according to this application, as shown in Figure 4. Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0331] The first communication device 450 includes a controller / processor 459, a memory 460, a data source 467, a transmitting processor 468, a receiving processor 456, a multi-antenna transmitting processor 457, a multi-antenna receiving processor 458, a transmitter / receiver 454, and an antenna 452.

[0332] The second communication device 410 includes a controller / processor 475, a memory 476, a receiver processor 470, a transmitter processor 416, a multi-antenna receiver processor 472, a multi-antenna transmitter processor 471, a transmitter / receiver 418, and an antenna 420.

[0333] In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, upper-layer data packets from the core network are provided to the controller / processor 475. The controller / processor 475 implements L2 layer functionality. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 450 based on various priority metrics. The controller / processor 475 is also responsible for retransmitting lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). Transmit processor 416 performs encoding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, and mapping of signal clusters based on various modulation schemes (e.g., Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), M-Phase Shift Keying (M-PSK), M-QAM). Multi-antenna transmit processor 471 performs digital spatial precoding on the encoded and modulated symbols, including codebook-based and non-codebook-based precoding, and beamforming processing to generate one or more spatial streams. Transmit processor 416 then maps each spatial stream to subcarriers, multiplexes it with a reference signal (e.g., a pilot) in the time and / or frequency domains, and subsequently uses inverse fast Fourier transform (IFFT) to generate a physical channel carrying the time-domain multicarrier symbol stream. Multi-antenna transmit processor 471 then performs transmit analog precoding / beamforming operations on the time-domain multicarrier symbol stream. Each transmitter 418 converts the baseband multicarrier symbol stream provided by the multi-antenna transmitter processor 471 into an radio frequency stream, which is then provided to different antennas 420.

[0334] In the transmission from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives a signal through its corresponding antenna 452. Each receiver 454 recovers the information modulated onto the radio frequency carrier and converts the radio frequency stream into a baseband multicarrier symbol stream, which is then provided to the receiver processor 456. The receiver processor 456 and the multi-antenna receiver processor 458 implement various signal processing functions of the L1 layer. The multi-antenna receiver processor 458 performs receive analog precoding / beamforming operations on the baseband multicarrier symbol stream from the receiver 454. The receiver processor 456 uses a Fast Fourier Transform (FFT) to convert the baseband multicarrier symbol stream after the receive analog precoding / beamforming operations from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receiver processor 456, where the reference signal is used for channel estimation, and the data signal is recovered in the multi-antenna receiver processor 458 after multi-antenna detection to recover any spatial stream destined for the first communication device 450. Symbols on each spatial stream are demodulated and recovered in the receive processor 456, generating soft decisions. The receive processor 456 then decodes and deinterleaves the soft decisions to recover the upper-layer data and control signals transmitted by the second communication device 410 over the physical channel. The upper-layer data and control signals are then provided to the controller / processor 459. The controller / processor 459 implements the functions of Layer 2. The controller / processor 459 may be associated with a memory 460 storing program code and data. The memory 460 may be referred to as computer-readable media. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 provides multiplexing, packet reassembly, decryption, header decompression, and control signal processing between the transport and logical channels to recover upper-layer data packets from the core network. The upper-layer data packets are then provided to all protocol layers above Layer 2. Various control signals may also be provided to Layer 3 for Layer 3 processing.

[0335] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, a data source 467 is used to provide upper-layer data packets to the controller / processor 459. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmission functions at the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels based on radio resource allocation, implementing L2 layer functions for the user plane and control plane. The controller / processor 459 is also responsible for retransmitting lost packets and signaling to the second communication device 410. Transmit processor 468 performs modulation mapping and channel coding processing, while multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming processing. Subsequently, transmit processor 468 modulates the generated spatial stream into a multi-carrier / single-carrier symbol stream. After analog precoding / beamforming operations in multi-antenna transmit processor 457, the stream is provided to different antennas 452 via transmitter 454. Each transmitter 454 first converts the baseband symbol stream provided by multi-antenna transmit processor 457 into a radio frequency symbol stream before providing it to antenna 452.

[0336] In the transmission from the first communication device 450 to the second communication device 410, the function at the second communication device 410 is similar to the receiving function at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives radio frequency signals through its corresponding antenna 420, converts the received radio frequency signals into baseband signals, and provides the baseband signals to the multi-antenna receiving processor 472 and the receiving processor 470. The receiving processor 470 and the multi-antenna receiving processor 472 jointly implement the L1 layer functions. The controller / processor 475 implements the L2 layer functions. The controller / processor 475 may be associated with a memory 476 that stores program code and data. The memory 476 may be referred to as computer-readable media. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides multiplexing between the transmission and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper-layer data packets from the UE 450. Upper-layer packets from the controller / processor 475 can be provided to the core network.

[0337] As one embodiment, the first communication device 450 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used with the at least one processor, and the first communication device 450 at least: receives a first RRC message, the first RRC message including configuration information for early uplink synchronization for a first candidate cell and configuration information for UE-based TA measurement for the first candidate cell; receives first signaling; wherein the first signaling indicates a first TA for the first candidate cell; and, in response to the receipt of the first signaling, applies the first TA for the first candidate cell; the UE-based TA measurement for the first candidate cell depends on the first TA for the first candidate cell.

[0338] As one embodiment, the first communication device 450 includes: a memory storing a computer-readable instruction program that, when executed by at least one processor, produces actions including: receiving a first RRC message, the first RRC message including configuration information for early uplink synchronization of a first candidate cell and configuration information for UE-based TA measurement of the first candidate cell; receiving first signaling; wherein the first signaling indicates a first TA of the first candidate cell; and, in response to the receipt of the first signaling, applying the first TA of the first candidate cell; wherein the UE-based TA measurement of the first candidate cell depends on the first TA of the first candidate cell.

[0339] As one embodiment, the second communication device 410 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used with the at least one processor. The second communication device 410 at least: transmits a first RRC message, the first RRC message including configuration information for early uplink synchronization of a first candidate cell and configuration information for UE-based TA measurement of the first candidate cell; transmits first signaling; wherein the first signaling indicates a first TA of the first candidate cell; a recipient of the first RRC message, in response to receiving the first signaling, applies the first TA of the first candidate cell; the UE-based TA measurement of the first candidate cell depends on the first TA of the first candidate cell.

[0340] As one embodiment, the second communication device 410 includes: a memory storing a computer-readable instruction program that, when executed by at least one processor, produces actions including: sending a first RRC message, the first RRC message including configuration information for early uplink synchronization of a first candidate cell and configuration information for UE-based TA measurement of the first candidate cell; sending a first signaling; wherein the first signaling indicates a first TA of the first candidate cell; a recipient of the first RRC message, in response to receiving the first signaling, applying the first TA of the first candidate cell; the UE-based TA measurement of the first candidate cell depending on the first TA of the first candidate cell.

[0341] As an example, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is used to receive the first RRC message.

[0342] As an example, at least one of the antenna 420, the transmitter 418, the transmitter processor 416, and the controller / processor 475 is used to transmit the first RRC message.

[0343] As an example, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is used to receive the first PDCCH order message.

[0344] As an example, at least one of the antenna 420, the transmitter 418, the transmitter processor 416, and the controller / processor 475 is used to transmit the first PDCCH order message.

[0345] As one embodiment, at least one of the antenna 452, the receiver 454, the receiving processor 456, and the controller / processor 459 is used to receive the first signaling.

[0346] As an example, at least one of the antenna 420, the transmitter 418, the transmission processor 416, and the controller / processor 475 is used to transmit the first signaling.

[0347] As one embodiment, at least one of the antenna 452, the transmitter 454, the transmission processor 468, and the controller / processor 459 is used to transmit the first Preamble.

[0348] As one embodiment, at least one of the antenna 420, the receiver 418, the receiving processor 470, and the controller / processor 475 is used to receive the first Preamble.

[0349] As an example, the first communication device 450 corresponds to the terminal in this application.

[0350] As an example, the second communication device 410 corresponds to the base station in this application.

[0351] As an example, the first communication device 450 is a user equipment.

[0352] As an example, the first communication device 450 is a base station device.

[0353] As an example, the first communication device 450 is a relay device.

[0354] As one embodiment, the second communication device 410 is a user equipment.

[0355] As one embodiment, the second communication device 410 is a base station device.

[0356] As one embodiment, the second communication device 410 is a relay device.

[0357] Example 5

[0358] Example 5 illustrates a wireless signal transmission flowchart according to an embodiment of this application, as shown in Figure 5. It should be noted that the order in this example does not limit the signal transmission order or the order of implementation in this application.

[0359] For terminal U01:

[0360] In step S5101, a first RRC message is received, which includes configuration information for early uplink synchronization of the first candidate cell and configuration information for UE-based TA measurement of the first candidate cell.

[0361] In step S5102, the first PDCCH order is sent;

[0362] In step S5103, before the first signaling is received, a first preamble is sent in the first candidate cell as a response to the receipt of the first PDCCH order;

[0363] In step S5104, a first signaling is received; the first signaling indicates the first TA of the first candidate cell;

[0364] In step S5105, in response to the receipt of the first signaling, the first TA of the first candidate cell is applied;

[0365] In step S5106, in response to the first TA of the first candidate cell, the first timeAlignmentTimer is started;

[0366] In step S5107, in response to the first TA applied to the first candidate cell, the UE-based TA measurement for the first candidate cell is stopped.

[0367] In step S5108, when the running time of the first timeAlignmentTimer is not less than the first threshold, the UE-based TA measurement for the first candidate cell is started.

[0368] In step S5109, as a response to the first condition being met, the configuration of the first candidate cell is applied;

[0369] For base station N02:

[0370] In step S5201, the first RRC message is sent;

[0371] In step S5202, the first PDCCH order is sent;

[0372] In step S5203, the first Preamble is received;

[0373] In step S5204, the first signaling is sent;

[0374] In Example 5, the UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell; the UE-based TA measurement for the first candidate cell depends on the running state of the first timeAlignmentTimer; the first threshold is not greater than the value of the first timeAlignmentTimer; the configuration information of the first candidate cell includes the first condition; the first condition depends on at least the L1 measurement for the first serving cell and the L1 measurement for the first candidate cell; the first PDCCH order indicates the first Preamble; the configuration information for early uplink synchronization of the first candidate cell includes the first Preamble.

[0375] As one example, the target operation is the first candidate;

[0376] As one embodiment, the terminal U01 and the base station N02 are wirelessly connected.

[0377] As one embodiment, the terminal U01 and the base station N02 are connected by a wire.

[0378] As one embodiment, the terminal U01 and the base station N02 are connected via a Uu port.

[0379] As one embodiment, the terminal U01 and the base station N02 are connected via an IAB port.

[0380] As one embodiment, the terminal U01 and the base station N02 are connected via a PC5 interface.

[0381] As an example, the dashed box F5.1 is optional.

[0382] As an example, the dashed box F5.1 is present.

[0383] As an example, the dashed box F5.1 does not exist.

[0384] As an example, the dashed box F5.2 is optional.

[0385] As an example, the dashed box F5.2 is present.

[0386] As an example, the dashed box F5.2 does not exist.

[0387] As an example, the dashed box F5.3 is optional.

[0388] As an example, the dashed box F5.3 is present.

[0389] As an example, the dashed box F5.3 does not exist.

[0390] As an example, the dashed box F5.4 is optional.

[0391] As an example, the dashed box F5.4 is present.

[0392] As an example, the dashed box F5.4 is not present.

[0393] As an example, the dashed box F5.5 is optional.

[0394] As an example, the dashed box F5.5 is present.

[0395] As an example, the dashed box F5.5 does not exist.

[0396] As an example, the length of the first timeAlignmentTimer is pre-configured.

[0397] As an example, the length of the first timeAlignmentTimer is configured by the first RRC message.

[0398] As an example, the first timeAlignmentTimer is for early uplink synchronization of the first candidate cell.

[0399] As an example, the first timeAlignmentTimer is the TAT (Time Alignment Timer) associated with the first candidate cell.

[0400] As an example, the first timeAlignmentTimer is a TAT associated with the PTAG of the first candidate cell.

[0401] As an example, applying the first TA of the first candidate cell means applying the first TA to the first candidate cell.

[0402] As an example, the first TA applied to the first candidate cell refers to applying the first TA to the PTAG of the first candidate cell.

[0403] As one example, in response to the first TA applied to the first candidate cell, the first timeAlignmentTimer is started or restarted.

[0404] As an example, the first candidate cell is associated with only one first timeAlignmentTimer.

[0405] As an example, starting the first timeAlignmentTimer includes restarting the first timeAlignmentTimer.

[0406] As an example, in response to the first TA applied to the first candidate cell, the first timeAlignmentTimer is started.

[0407] As an example, the UE-based TA measurement for the first candidate cell depending on the running state of the first timeAlignmentTimer means that, in response to the first timeAlignmentTimer being running, the UE-based TA measurement for the first candidate cell is not performed.

[0408] As an example, the UE-based TA measurement for the first candidate cell depending on the running state of the first timeAlignmentTimer means that the UE-based TA measurement for the first candidate cell is performed in response to the first timeAlignmentTimer not being running.

[0409] As an example, the first timeAlignmentTimer not being run includes the first timeAlignmentTimer timeout.

[0410] As an example, the first TA applied to the first candidate cell refers to applying the first TA to the PTAG of the first candidate cell.

[0411] As an example, stopping UE-based measurements for the first candidate cell means considering that the UE-based TA measurement for the first candidate cell has been deactivated.

[0412] As an example, stopping UE-based measurements for the first candidate cell means assuming that the UE-based TA measurement for the first candidate cell is not configured.

[0413] As an example, in response to the start of the first timeAlignmentTimer, the UE-based TA measurement for the first candidate cell is stopped.

[0414] As an example, during the operation of the first timeAlignmentTimer, no UE-based TA measurement is performed for the first candidate cell.

[0415] As an example, when the first TA of the first candidate cell is applied, is the configuration of the UE-based TA measurement dependent on the network for the first candidate cell stopped?

[0416] As an example, when the first TA of the first candidate cell is applied, whether to stop the UE-based TA measurement for the first candidate cell depends on the first RRC message.

[0417] As an example, the first RRC message configures whether to stop the UE-based TA measurement for the first candidate cell when the first TA of the first candidate cell is applied.

[0418] As an example, when the first TA of the first candidate cell is applied, whether to stop the UE-based TA measurement dependent terminal for the first candidate cell.

[0419] As an example, the runtime of the first timeAlignmentTimer refers to the current value of the first timeAlignment.

[0420] As one example, the start includes continuing.

[0421] As one example, the start includes initiation.

[0422] As an example, if the running time of the first timeAlignmentTimer is less than the first threshold, the UE-based TA measurement for the first candidate cell is not started.

[0423] As an example, the "not starting" includes "terminating".

[0424] As an example, "not starting" includes "pausing".

[0425] As an example, the first threshold is the value of the first timeAlignmentTimer; when the start of the UE-based TA measurement for the first candidate cell depends on the running time of the first timeAlignmentTimer being not less than the first threshold, it means when the first timeAlignmentTimer expires.

[0426] As an example, the first threshold is less than the value of the first timeAlignmentTimer.

[0427] As an example, the size of the first threshold is pre-configured.

[0428] As an example, the size of the first threshold is configured in the first RRC message.

[0429] As an example, the size of the first threshold is determined by the terminal itself.

[0430] As an example, the candidate value of the size of the first threshold is configured in the first RRC message.

[0431] As an example, the candidate values ​​for the size of the first threshold are predefined.

[0432] As an example, the first RRC message configures at least one candidate value for the size of the first threshold.

[0433] As an example, the size of the first threshold is fixed.

[0434] As an example, the size of the first threshold is 0.

[0435] As an example, the first threshold does not exist.

[0436] As a sub-implementation of the above embodiments, the absence of the first threshold means that when the first timeAlignmentTimer times out, the UE-based TA measurement for the first candidate cell begins.

[0437] As an example, the first threshold not being greater than the value of the first timeAlignmentTimer means that the first threshold is not greater than the maximum value of the first timeAlignmentTimer.

[0438] As an example, the first threshold not being greater than the value of the first timeAlignmentTimer means that: the first threshold is determined by the terminal, the value of the first timeAlignmentTimer is configured by the network, and the first threshold is not greater than the value of the first timeAlignmentTimer.

[0439] As an example, the first threshold is updated in response to the first timeAlignmentTimer being updated.

[0440] As an example, the first threshold has a maximum value.

[0441] As an example, the maximum value of the first threshold is the value of the first timeAlignmentTimer.

[0442] As an example, the maximum value of the first threshold is configured by the network.

[0443] As an example, the maximum value of the first threshold is configured by the first RRC message.

[0444] As an example, the maximum value of the first threshold is fixed.

[0445] As an example, the maximum value of the first threshold depends on the first timeAlignmentTimer.

[0446] As an example, the maximum value of the first threshold is a proportional value.

[0447] As an example, the maximum value of the first threshold refers to the proportion relative to the first timeAlignmentTimer.

[0448] As an example, the minimum value of the first threshold is 0.

[0449] As an example, the runtime of the first timeAlignmentTimer refers to the current value of the first timeAlignment.

[0450] As one example, the start includes continuing.

[0451] As one example, the start includes initiation.

[0452] As an example, if the running time of the first timeAlignmentTimer is less than the first threshold, the UE-based TA measurement for the first candidate cell is not started.

[0453] As an example, the "not starting" includes "terminating".

[0454] As an example, "not starting" includes "pausing".

[0455] As an example, the first threshold is the value of the first timeAlignmentTimer; when the start of the UE-based TA measurement for the first candidate cell depends on the running time of the first timeAlignmentTimer being not less than the first threshold, it means when the first timeAlignmentTimer expires.

[0456] As an example, the first threshold is less than the value of the first timeAlignmentTimer.

[0457] As an example, the size of the first threshold is pre-configured.

[0458] As an example, the size of the first threshold is configured in the first RRC message.

[0459] As an example, the size of the first threshold is determined by the terminal itself.

[0460] As an example, the candidate value of the size of the first threshold is configured in the first RRC message.

[0461] As an example, the candidate values ​​for the size of the first threshold are predefined.

[0462] As an example, the first RRC message configures at least one candidate value for the size of the first threshold.

[0463] As an example, the size of the first threshold is fixed.

[0464] As an example, the size of the first threshold is 0.

[0465] As an example, the first threshold does not exist.

[0466] As a sub-implementation of the above embodiments, the absence of the first threshold means that when the first timeAlignmentTimer times out, the UE-based TA measurement for the first candidate cell begins.

[0467] As an example, the first threshold not being greater than the value of the first timeAlignmentTimer means that the first threshold is not greater than the maximum value of the first timeAlignmentTimer.

[0468] As an example, the first threshold not being greater than the value of the first timeAlignmentTimer means that: the first threshold is determined by the terminal, the value of the first timeAlignmentTimer is configured by the network, and the first threshold is not greater than the value of the first timeAlignmentTimer.

[0469] As an example, the first threshold is updated in response to the first timeAlignmentTimer being updated.

[0470] As an example, the first threshold has a maximum value.

[0471] As an example, the maximum value of the first threshold is the value of the first timeAlignmentTimer.

[0472] As an example, the maximum value of the first threshold is configured by the network.

[0473] As an example, the maximum value of the first threshold is configured by the first RRC message.

[0474] As an example, the maximum value of the first threshold is fixed.

[0475] As an example, the maximum value of the first threshold depends on the first timeAlignmentTimer.

[0476] As an example, the maximum value of the first threshold is a proportional value.

[0477] As an example, the maximum value of the first threshold refers to the proportion relative to the first timeAlignmentTimer.

[0478] As an example, the minimum value of the first threshold is 0.

[0479] As an example, the first condition is configured by the first RRC message.

[0480] As an example, the first condition is a switching condition of a conditional LTM.

[0481] As an example, the first condition is a triggering condition.

[0482] As an example, the first condition depends on the measurement.

[0483] As an example, the first condition depends on at least the former of the L1 measurement for the first serving cell and the L1 measurement for the first candidate cell.

[0484] As an example, the first conditional dependence on the L1 measurement for the first serving cell refers to the cell quality of the L1 measurement of the first serving cell.

[0485] As an example, the first conditional dependence on the L1 measurement for the first serving cell refers to the beam quality of the L1 measurement for the first serving cell.

[0486] As an example, the first conditional dependence on the L1 measurement for the first candidate cell refers to the cell quality of the L1 measurement of the first candidate cell.

[0487] As an example, the first conditional dependence on the L1 measurement for the first candidate cell refers to the beam quality of the L1 measurement for the first candidate cell.

[0488] As an example, the first condition is that the measurement result of the L1 measurement for the first serving cell is less than a third threshold.

[0489] As an example, the first condition is that the measurement result of the L1 measurement for the first candidate cell is greater than a fourth threshold.

[0490] As an example, the first condition is that the L1 measurement result for the first serving cell is less than the third threshold and the L1 measurement result for the first candidate cell is greater than the fourth threshold.

[0491] As an example, the first condition is that the L1 measurement result for the first serving cell is less than the L1 measurement result for the first candidate cell.

[0492] As an example, the third threshold is configured in the first RRC message.

[0493] As an example, the fourth threshold is configured in the first RRC message.

[0494] As an example, in response to the first condition being met, the first TA of the first candidate cell is applied.

[0495] As an example, in response to the first condition being met, the second TA of the first candidate cell is applied.

[0496] As an example, in response to the first condition being met, whether the first TA or the second TA of the first candidate cell is applied depends on the configuration of the first RRC message.

[0497] As an example, in response to the first condition being met, whether the first TA or the second TA of the first candidate cell is applied depends on the terminal.

[0498] As an example, the first Preamble triggers the first signaling.

[0499] As one example, the first signaling is received in response to sending the first Preamble.

[0500] As an example, the first PDCCH order is received on the first serving cell.

[0501] As an example, the first PDCCH order is a DCI format 1_0.

[0502] As an example, the first PDCCH order indicates the Preamble index of the first Preamble.

[0503] As an example, the first PDCCH order indicates the SSB index associated with the first Preamble.

[0504] As an example, the first PDCCH order indicates the first candidate cell.

[0505] As an example, the first Preamble uses one CFRA resource of the first candidate cell.

[0506] As an example, in response to the first candidate cell having no available TA and not receiving the first PDCCH order, a first request is sent.

[0507] As an example, the first request is to request the first PDCCH order.

[0508] As an example, the first request is a UCI.

[0509] As an example, the first request is a MAC CE.

[0510] As an example, "no available TA in the first candidate cell" means that the first TA in the first candidate cell is unavailable.

[0511] As an example, "no available TA in the first candidate cell" means that the second TA in the first candidate cell is unavailable.

[0512] As an example, "no available TA in the first candidate cell" means that both the first TA and the second TA in the first candidate cell are unavailable.

[0513] As an example, "no available TA in the first candidate cell" means that the TA of the first candidate cell is invalid.

[0514] As an example, the first request indicates that there is no valid TA for the first candidate cell.

[0515] As an example, the first RRC message configures the radio resources carrying the first request.

[0516] As an example, the first RRC message configures the triggering of the first request.

[0517] As an example, the first RRC message configures the format of the first request.

[0518] As an example, in response to sending the first request, the first PDCCH order is received.

[0519] As an example, in response to sending the first request, a first timer is started.

[0520] As an example, the length of the first timer is pre-configured.

[0521] As an example, the length of the first timer is fixed.

[0522] As an example, the first timer is configured by the uplink synchronization configuration information for the first candidate cell.

[0523] As one example, in response to the first timer not running, the first request is retransmitted.

[0524] As an example, the first request has a maximum number of retransmissions.

[0525] As an example, the maximum number of retransmissions is pre-configured.

[0526] As an example, the maximum number of retransmissions is fixed.

[0527] As an example, the maximum number of retransmissions is configured in the first RRC message.

[0528] As an example, the maximum number of retransmissions is configured by the uplink synchronization configuration information for the first candidate cell.

[0529] Example 6

[0530] Example 6 illustrates a schematic diagram of the relationship between the first TA and the second TA and the second threshold according to an embodiment of the present application, as shown in Figure 6.

[0531] In Example 6, the difference between the first TA and the second TA is greater than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0532] As an example, the second threshold is pre-configured.

[0533] As an example, the second threshold is a fixed value.

[0534] As an example, the second threshold has a default value.

[0535] As one example, the second threshold is configured in the first RRC message.

[0536] As one example, the second threshold is determined by the terminal.

[0537] As an example, the second TA is the TA of the first candidate cell obtained by UE-based TA measurement of the first candidate cell.

[0538] As an example, the difference between the first TA and the second TA being greater than the second threshold means that the absolute value of the difference between the first TA and the second threshold is greater than the second threshold; the second threshold is a non-negative number.

[0539] As one example, "greater than" includes "not less than".

[0540] As an example, in response to the receipt of the first signaling, when the difference between the first TA and the second TA is greater than the second threshold, the first TA of the first candidate cell is applied.

[0541] As an example, in response to the receipt of the first signaling, when the difference between the first TA and the second TA is greater than the second threshold, the UE-based TA measurement for the first candidate cell is stopped.

[0542] As an example, the first TA of the first candidate cell is applied as a response to the difference between the first TA and the second TA being greater than the second threshold.

[0543] As an example, in response to the difference between the first TA and the second TA being greater than the second threshold, the UE-based TA measurement for the first candidate cell is stopped.

[0544] Example 7

[0545] Example 7 illustrates a schematic diagram of the relationship between the first TA and the second TA and the second threshold according to another embodiment of this application, as shown in Figure 7.

[0546] In Example 7, the difference between the first TA and the second TA is less than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0547] As an example, the difference between the first TA and the second TA being less than the second threshold means that the absolute value of the difference between the first TA and the second threshold is less than the second threshold; the second threshold is a non-negative number.

[0548] As one example, "less than" includes "not greater than".

[0549] As an example, in response to the receipt of the first signaling, when the difference between the first TA and the second TA is less than the second threshold, the first TA of the first candidate cell is not applied.

[0550] As an example, in response to the receipt of the first signaling, when the difference between the first TA and the second TA is less than the second threshold, the UE-based TA measurement for the first candidate cell is not stopped.

[0551] As an example, in response to the difference between the first TA and the second TA being less than the second threshold, the first TA of the first candidate cell is applied.

[0552] As an example, in response to the difference between the first TA and the second TA being less than the second threshold, the second TA of the first candidate cell is applied.

[0553] As an example, the TA of the first candidate cell is updated in response to the difference between the first TA and the second TA being less than the second threshold.

[0554] As a sub-implementation of the above embodiments, the TA of the first candidate cell is updated using the first TA.

[0555] As a sub-implementation of the above embodiments, the TA of the first candidate cell is updated using the second TA.

[0556] As a sub-implementation of the above embodiments, the TA of the first candidate cell is updated using the third TA.

[0557] As a supplementary embodiment of the above sub-example, the third TA depends on the first TA and the second TA.

[0558] As an additional embodiment of the above sub-example, the third TA is the average value of the first TA and the second TA.

[0559] As a supplementary embodiment of the above sub-example, the third TA is the output of the first function.

[0560] As a supplementary embodiment of the above sub-example, the first TA and the second TA are the inputs of the first function.

[0561] As a supplementary embodiment of the above sub-example, the first function depends on the first coefficient.

[0562] As a supplementary embodiment of the above sub-example, the first function is predefined.

[0563] As a supplementary embodiment of the above sub-example, the first coefficient is configured by the first RRC message.

[0564] As a supplementary embodiment of the above sub-example, the first coefficient is determined by the terminal.

[0565] As an additional embodiment of the above sub-example, the first function is: f(x,y)=0.5*(a*x+ya*y); where a is the first coefficient, x is the first TA, and y is the second TA.

[0566] As a supplementary embodiment of the above sub-example, the first function depends on the second coefficient.

[0567] As a supplementary embodiment of the above sub-example, the second coefficient is predefined.

[0568] As a supplementary embodiment of the above sub-example, the second coefficient is configured in the first RRC message.

[0569] As a supplementary embodiment of the above sub-example, the second coefficient is determined by the terminal.

[0570] As a supplementary embodiment of the above sub-example, the third TA is a weighted average of the first TA and the second TA.

[0571] As an additional embodiment of the above sub-example, the first coefficient and the second coefficient are the weights of the weighted average, and the sum of the first coefficient and the second coefficient is 1.

[0572] As an example, in response to the difference between the first TA and the second TA being less than the second threshold, the UE-based TA measurement for the first candidate cell is not stopped.

[0573] Example 8

[0574] Example 8 illustrates a structural block diagram of a processing device in a terminal according to an embodiment of this application; as shown in Figure 8. In Figure 8, the terminal 800 includes a first transmitter 801 and a first processor 802.

[0575] The first processor 802 receives a first RRC message, the first RRC message including configuration information for early uplink synchronization of the first candidate cell and configuration information for UE-based TA measurement of the first candidate cell; receives a first signaling, wherein the first signaling indicates the first TA of the first candidate cell; and applies the first TA of the first candidate cell as a response to the receipt of the first signaling.

[0576] In Example 8, the UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell.

[0577] As one embodiment, the first processor 802, in response to the first TA of the first candidate cell, starts a first timeAlignmentTimer; wherein the UE-based TA measurement for the first candidate cell depends on the running state of the first timeAlignmentTimer.

[0578] As an example, the first processor 802, in response to the first TA of the first candidate cell, stops the UE-based TA measurement for the first candidate cell.

[0579] As an example, the first processor 802 starts the UE-based TA measurement for the first candidate cell when the running time of the first timeAlignmentTimer is not less than a first threshold; the first threshold is not greater than the value of the first timeAlignmentTimer.

[0580] As an example, the difference between the first TA and the second TA is greater than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0581] As an example, the difference between the first TA and the second TA is less than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0582] As an example, the first processor 802, in response to the first condition being met, applies the configuration of the first candidate cell; the configuration information of the first candidate cell includes the first condition; the first condition depends on at least the L1 measurement for the first serving cell and the L1 measurement for the first candidate cell.

[0583] As an example, the first transmitter 801, before the first signaling is received, sends a first preamble in the first candidate cell as a response to the receipt of a first PDCCH order; the first PDCCH order indicates the first preamble; the configuration information for early uplink synchronization of the first candidate cell includes the first preamble.

[0584] As one embodiment, the terminal includes: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code including computer instructions, and the one or more processors call the computer instructions to cause the terminal to perform the method in the communication node used for wireless communication.

[0585] As one embodiment, the terminal includes: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code including computer instructions, and the one or more processors call the computer instructions to cause the terminal to perform the method described in this application for use in a terminal.

[0586] As one embodiment, the first receiver includes at least one of the following in Figure 4 of this application: antenna 452, receiver 454, multi-antenna receiver processor 458, receiver processor 456, controller / processor 459, memory 460, or data source 467.

[0587] As one embodiment, the first receiver includes at least an antenna 452 and a receiver 454 as shown in Figure 4 of this application.

[0588] As one embodiment, the first transmitter 801 includes at least one of the following in Figure 4 of this application: antenna 452, transmitter 454, multi-antenna transmitter processor 457, transmitter processor 468, controller / processor 459, memory 460, or data source 467.

[0589] As one embodiment, the first transmitter 801 includes at least an antenna 452 and a transmitter 454 as shown in Figure 4 of this application.

[0590] Example 9

[0591] Example 9 illustrates a structural block diagram of a processing apparatus for a base station according to an embodiment of the present application; as shown in Figure 9. In Figure 9, the base station 900 includes a second transmitter 901 and a second receiver 902.

[0592] The second transmitter 901 sends a first RRC message, the first RRC message including configuration information for early uplink synchronization of the first candidate cell and configuration information for UE-based TA measurement of the first candidate cell; and sends a first signaling; wherein the first signaling indicates the first TA of the first candidate cell;

[0593] In Embodiment 9, the recipient of the first RRC message, in response to receiving the first signaling, applies the first TA of the first candidate cell; the UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell.

[0594] As an example, the recipient of the first RRC message, in response to the first TA of the first candidate cell, starts the first timeAlignmentTimer; the UE-based TA measurement for the first candidate cell depends on the running state of the first timeAlignmentTimer.

[0595] As an example, the recipient of the first RRC message, in response to the first TA applied to the first candidate cell, stops the UE-based TA measurement for the first candidate cell.

[0596] As an example, when the running time of the first timeAlignmentTimer is not less than a first threshold, the UE-based TA measurement for the first candidate cell is started; the first threshold is not greater than the value of the first timeAlignmentTimer.

[0597] As an example, the difference between the first TA and the second TA is greater than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0598] As an example, the difference between the first TA and the second TA is less than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

[0599] As an example, in response to the first condition being met, the configuration of the first candidate cell is applied; the configuration information of the first candidate cell includes the first condition; the first condition depends on at least the L1 measurement for the first serving cell and the L1 measurement for the first candidate cell.

[0600] As one embodiment, the second receiver 902, before sending the first signaling, receives a first preamble in the first candidate cell as a response to sending a first PDCCH order; the first PDCCH order indicates the first preamble; the configuration information for early uplink synchronization of the first candidate cell includes the first preamble.

[0601] As one embodiment, the base station includes: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code including computer instructions, and the one or more processors call the computer instructions to cause the base station to perform the method in the communication node used for wireless communication.

[0602] Those skilled in the art will understand that all or part of the steps in the above methods can be implemented by a program instructing related hardware, and the program can be stored in a computer-readable storage medium, such as a read-only memory, hard disk, or optical disk. Optionally, all or part of the steps in the above embodiments can also be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiments can be implemented in hardware or in the form of software functional modules. This application is not limited to any specific combination of software and hardware. The user equipment, terminal, and UE in this application include, but are not limited to, drones, communication modules on drones, remote-controlled aircraft, aircraft, small aircraft, mobile phones, tablets, laptops, vehicle-mounted communication devices, wireless sensors, internet cards, IoT terminals, RFID terminals, NB-IoT terminals, MTC (Machine Type Communication) terminals, eMTC (enhanced MTC) terminals, data cards, internet cards, vehicle-mounted communication devices, low-cost mobile phones, low-cost tablets, and other wireless communication devices. The base station or system equipment in this application includes, but is not limited to, macrocell base stations, microcell base stations, home base stations, relay base stations, gNB (NR Node B), TRP (Transmitter Receiver Point), and other wireless communication equipment.

[0603] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method used in a terminal, characterized in that, include: Receive a first RRC message, the first RRC message including configuration information for early uplink synchronization for the first candidate cell and configuration information for UE-based TA measurement for the first candidate cell; Receive first signaling; wherein, the first signaling indicates the first TA of the first candidate cell; In response to the receipt of the first signaling, the first TA of the first candidate cell is applied; The UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell.

2. The method according to claim 1, characterized in that, In response to the first TA of the first candidate cell, a first timeAlignmentTimer is started; wherein the UE-based TA measurement for the first candidate cell depends on the running state of the first timeAlignmentTimer.

3. The method according to claim 2, characterized in that, In response to the first TA of the first candidate cell, the UE-based TA measurement for the first candidate cell is stopped.

4. The method according to claim 2 or 3, characterized in that, include: When the running time of the first timeAlignmentTimer is not less than the first threshold, the UE-based TA measurement for the first candidate cell begins. Wherein, the first threshold is not greater than the value of the first timeAlignmentTimer.

5. The method according to any one of claims 1 to 4, characterized in that, The difference between the first TA and the second TA is greater than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

6. The method according to any one of claims 1 to 4, characterized in that, The difference between the first TA and the second TA is less than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

7. The method according to any one of claims 1 to 6, characterized in that, In response to the first condition being met, the configuration of the first candidate cell is applied; The configuration information of the first candidate cell includes the first condition; the first condition depends on at least the L1 measurement for the first serving cell and the L1 measurement for the first candidate cell.

8. The method according to any one of claims 1 to 7, characterized in that, Before the first signaling is received, a first preamble is sent in the first candidate cell as a response to the receipt of the first PDCCH order; Wherein, the first PDCCH order indicates the first Preamble; the configuration information for early uplink synchronization of the first candidate cell includes the first Preamble.

9. A terminal, characterized in that, The terminal includes: one or more processors and memory; The memory is coupled to the one or more processors, the memory being used to store computer program code, the computer program code including computer instructions, the one or more processors invoking the computer instructions to cause the terminal to perform the method as described in any one of claims 1-8.

10. A method used in a base station, characterized in that, include: Send a first RRC message, the first RRC message including configuration information for early uplink synchronization for the first candidate cell and configuration information for UE-based TA measurement for the first candidate cell; Send a first signaling instruction; wherein the first signaling instruction indicates the first TA of the first candidate cell; In this context, the recipient of the first RRC message, in response to receiving the first signaling, applies the first TA of the first candidate cell; the UE-based TA measurement for the first candidate cell depends on the first TA of the first candidate cell.

11. The method according to claim 10, characterized in that, The recipient of the first RRC message, in response to the first TA of the first candidate cell, starts the first timeAlignmentTimer; the UE-based TA measurement for the first candidate cell depends on the running state of the first timeAlignmentTimer.

12. The method according to claim 11, characterized in that, The recipient of the first RRC message, in response to the first TA applied to the first candidate cell, stops the UE-based TA measurement for the first candidate cell.

13. The method according to claim 11 or 12, characterized in that, include: When the running time of the first timeAlignmentTimer is not less than the first threshold, the UE-based TA measurement for the first candidate cell begins. Wherein, the first threshold is not greater than the value of the first timeAlignmentTimer.

14. The method according to any one of claims 10 to 13, characterized in that, The difference between the first TA and the second TA is greater than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

15. The method according to any one of claims 10 to 13, characterized in that, The difference between the first TA and the second TA is less than a second threshold; the second TA is based on the UE-based TA measurement for the first candidate cell.

16. The method according to any one of claims 10 to 15, characterized in that, In response to the first condition being met, the configuration of the first candidate cell is applied; The configuration information of the first candidate cell includes the first condition; the first condition depends on at least the L1 measurement for the first serving cell and the L1 measurement for the first candidate cell.

17. The method according to any one of claims 10 to 16, characterized in that, Before sending the first signaling, in response to sending the first PDCCH order, a first preamble is received in the first candidate cell; Wherein, the first PDCCH order indicates the first Preamble; the configuration information for early uplink synchronization of the first candidate cell includes the first Preamble.

18. A base station, characterized in that, The base station includes: one or more processors and a memory; The memory is coupled to the one or more processors, the memory being used to store computer program code, the computer program code including computer instructions, the one or more processors invoking the computer instructions to cause the base station to perform the method as described in any one of claims 10-17.

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